Hemming machine and process of forming bag tubing



July 19, 1927. .63 17 A. KRA'SA immune momma AND rnocnss 0F FORMING BAG TUBING Filed March 16, 1922 s shah-sheet '1 v; N aka/"i Ifrifwe g JZZZGY'Z Era 50o mfm 63 {MM 0k MEI flitormys July 19, 1927.

A. KRASA HEMMING MACHINE AND PROCESS OF FORMING BAG TUBING Filed March 16, 1922 a sh n-sue 2 x 1 N w H 0 w R ALE- T QL K i 15?;08722502 lzifize sjsi JZZZer lira 5w W WWW 6 MA c fliorneys.

July 199 1 7 A. KRASA HEMMING MACHINE AND PROCESS OF FORMING BAG TUBING Filed March 1 1922 s Shaka-sheet 3 2'7 GZG/ 3 l I I i H 5 J .I J3 y l J2 a a i i I l I I i v Cr l 20 t 4 M 7 1 u M S 7 i 620 r w C J j 1 iii L 103 w jfi'irzeysfl B JZZZer Erap'w.

July 19, 1927. 36,517

A. KRASA HEIMING MACHINE AND PROCESS OF FORMING BAG TUBING Filed March 16, 1922 s Shootg-Shqet fl z.

I ////III/11110111I;IIIIIIIIIII)IIIII!!!I! j I \xx s M3. 71F? w lnvc 722607? JFifnepjsf V? Z 56 T'L 171L501.

Jul 19 1927.

y A. KRASA HEMMING MACHINE AND PROCESS OF FORMING BAG TUBING Filed March 1 1922 6 Shqgig-Shget 5 FMM fl ttorraeypf July 19, 1927. 1,636,517

A. KRASA HEMMING MACHINE AND PROCESS OF FORMING BAG TUBING Filed March 16, 1922 s sheets-Sheet 6 W flveniw? JZZZar firm 5w.

Patented July 19, 1927.

UNITED STATES PATENT OFFICE.

ALBERT KRASA, OF CHICAGO, ILLINOIS, ASSIGNOR TO BATES VALVE BAG COMPANY, 01' CHICAGO, ILLINOIS, A CORPORATION 01 WEST VIRGINIA.

HEMMING MACHINE AND PROCESS OF FORMING BAG TUBING.

Application filed March 18, 1922. Serial No. 544,127.

My invention relates to a hemming machine and the process of hemming and forming bag tubing, and has for its ob ect the provision of a machine with which bag ing may be formed having one longitudinal seam, the edges of thecloth being lnwardly turned before sewing and the seam being sewed along the opposed inwardly turned edges, and through them, making four thicknesses.

The machine is particularly adapted for use with bag forming machinery wherein a tube is formed from a roll of bagging material and the tube is either continuously or after a storage interval formed into bags by a process which consists in closing the bottom of the tube. charging material therein and cutting and severing the lower portion of the tube when thus filled. Other purposes of my invention will appear from time to time in the course of the specification.

I illustrate my invention more or less diagrammatically in the following drawings; wherein:

Figure 1 is a plan View of-the sewing portion of my invention; I

Figure 2 is a section on the line 22 of Figure 1;

Figure 3 is a section on the line 3-3 of Figure 2;

Figure 4 is a section on the line 4- 1 of Figure 2;

Figure 5 is a section on the l1nc 55 of Figure 2;

Figure 6 is a plan View of the hemming element; I

Figure 7 is a section on the line 77 of Figure 5;

Figure 8 is a section on the hue 88 of Figure 5; I

Figure 9 is a section on the line 9-9 of Figure 5; i

Figure 10 is a section on the hue 10-10 of Figure 5;

Figure 11 is a section on the line 1111 of Fig. 1;

Figure 12 is a plan View of the supply roll and fabric feeding portion of the machine;

Figure. 13 is a side elevation of the structure shown in Figure 12;

Figure 14 is a section on the line 1%14 of Fig. 13;

Figure 15 is a section on the line 15-15 of Figure 13.

Like parts are indicated by like indicating symbols throughout the drawings and specifications.

A is a roll of material to be used from which may be fed a fiat strip of material A The roll lies on a horizontal-circular rotating shelf A which is pinned upon the vortical rotating shaft A which is mounted On any suitable framework A supported for example by the legs A The bottom of the shaft A rotates in ball bearings A, asso ciated with any suitable constant frictional brake A adapted automatically to prevent any abnormal speed of rotation of the shaft. The top of the shaft is tapered at A and lndented to receive a pointed bolt A which is adjustable in the hinge member A on the vertical channel arm frame A which is joined to the base by the plate A". Spaced outwardly from the frame A is a vertical guide B, illustrated as a tube, which is joined to the frame member A at top and bottom by adjacent spacing elements B slotted at B to receive the adjusting bolts B Thus the guide may be adjusted to fabric and tubes of various sizes.

The fabric strip A passes about the vertical guide B and is then folded along its central axis to form a doubled strip C which passes over any suitable horizontal guide C illustrated as a hook shaped metallic member mounted on the bracket arm C The doubled tube C passes across the support C and its adjacent free edges then pass into a hemmer plate D which will later be described in detail. The effect of this plate is to turn each edge of the cloth inwardly to produce a pair of opposed inwardly turned flaps or edges as shown in Figure 10. The tube edges then pass between a pair of knurled rollers E E lying in opposition one above and one below the tube and rotating in oppositedirections to draw the edge of the shaft E aremounted on the bracket F which i pivoted at its ends upon the shaft F which in turn is secured at its ends to .the upwardly projecting frame members F F and siutably supported upon the base of the machine as for example by the screw plate F The roller E is mounted on the shaft- F which rotates in the members F F At the outer end of F is a pinion F in mesh with the second helical gear F on the shaft E. The roller E is normally drawn down upon the roller E by the adju table spring G which is adjustably secured to thebase of the machine, at its lower end, as for example by the bolt G and nut G and at its top is secured in any suitable way to the bracket F. A pivoted cam element H is illustrated having a handle H whereby the upper roller may be manually lifted from contact with the lower roller, if so desired. A stop H limits the movement of the .cam element as shown in Figure 4. Between the rollers and the sewing means, later to be de-. scribed, lies the guide plate I having a portion I folded over its base portion and spaced apart therefrom sufficiently to admit the free passage of the requisite four layers of cloth. The guide plate is secured to the base of the machine as by a screw plate I J is the usual form of presser foot mounted on the presser shaft J passing through the guide J and movable on a vertical axis.

Secured to the presser shaft is the outwardly bent arm J 3 terminating in a hook J which underlies the shaft E of the roller E. Thus, if the presser foot J is lifted for the pur- 13076 of repair and adjustment, the roller E is automaticallylifted from contact with its opposed roller E. K is any siutable sewing needle mounted in the sewing shaft K, which is driven from any suitable power source in the usual way.

Any suitable means, shown ,dia rarnmati'cally at J may be placed hence the .presser foot. and nee'dle to, draw the fabric beneath the needle in the sewing operation. The mechanism m y be. f r xam 1a; the s toothed reciprocating plate usually used for h purpo th se n ma s. The se ed s ip thee as f qr it we. r P as roll comprising a roller L'and theruhbr surface L thereupon, the roller L being 1 mounted in the bearings L L and being normally rotated by a pulley L at the end thereof through a belt l'i driven from any operation. This plate may be of any suitable form to perform the desired function, namely. to inwardly turn each of the opposed tube or strip edges, but I illustrate a preferred form wherein this function is satisfactorily performed. The outer edges of the hemmer plate, asshown in section in Figure 7 comprise two hem forming sections, the upper one comprising the opposed sides M M and the lower one comprising the opposed sides M M, which may be, if desired, formed from one piece of spring sheet metal. It will be noted that as the material enters the hemmer plate the edges are slightly inwardly turned as at M M. The sheet metal bends M- M have as function to support the parts of the hemmer and properly to space them. The hemmer is progressively flattened from the inlet portion tothe outlet portion and Figure 8 illustrates a further section wherein by the curvature of the upper and lower portions the edges of the cloth have been brought about a relatively narrow arc and now lie within the folded tube body as at M M. The cross section of the hemmer at its inner end is shown in Fig. 9 Where the folding is completed and the edges of the tubing have been inwardly folded at M M to the proper position for sewing. The 0 posed folded edges then pass through the r0 lers E E and through the guide plate I Ito the presser foot and needle. A renewable wire M protects the corners of the hemmer plate at the point of greatest Wear where, the outer edges of the folded fabric initially engage the hemmer at its outer angles as shown in Figures 5 and 6.

While I have illustrated a working device and one which is now being practically are as fol owsj;

The material which is to be sewed into a tube is fed forward from the vertically supported ro'll about a-vertical guide. The roll is supplied with an automatic friction brake which limits the speed of the feed and the vertical guide may .be adjusted to bring the strip in proper position for folding and hemming various sizes of tube. The outer end of the tube is carried across the support C? as it is folded, and its opposed edges are fed into the hemmer plate, drawn between the pressure or feed rollers E E, passed between the presser foot and the base of the machine and finally the sewed tube is carried forward over the rubber feeding roll. When the device is set in operation the opposed rollers E E are kept yieldingly in engagement with each other and their roughened or knurled surfaces draw the tube through the hemmer. As the tube is thus drawn the opposed edges are each inwardly folded. The tubing issues from the hemmer plate in proper position for the hemmlng or sewing operation. It passes through the guide plate I I and under the presser foot beneath which reciprocates any suitable material feeding means. All the tension and force of drawing the material through the hemmer plate is provided by the knurled rollers and no strain is placed on the needles. This is important since by irregularities of the fablie or minor interruptions in its flow a strain would be put on the needle far greater than could be dealt with by the usual fabric feeding means in association with the sewing means. The result would be frequentbreakage of the needle and stoppage of the whole process. This is prevented by the positive driving of the two feeding rollers. Only the edges to be hemmed pass through the hemmer. and the operation of the hemmer as well as that of the drawing rollers is irrespective of the size of the tubebeing formed, so that neither hemmer nor drawing device requires change to form tubes of different sizes.

However, because only the edges enter thehem turning device, these edges might enter varying distances, or escape entirely, if they were not properly guided and held in line. The guide roller B is adjusted so that the material will enter the hem turning device at the proper angle to insure turning the edges the amount desired without causing excessive wear on the plates or strain on the material. The brake is adjusted so as to insure that the material will not become, slack, but will be held in the line to which it is guided by the roller B. The folded tube which is thus additionally compresed for the sewing. if such compression is necessary, passes through the earlier mentioned guide plate and to the sewing means, the fabric being fed forward as above described. The gathering of the material about the sewing gether the edges of a strip and turning said edges to form a hem, means contacting the edges only for drawing said edges through the hem-turning device, a sewing head having a resser foot and adapted to sew a seam ongitudinally through the turned edges, and means connected to the presser foot whereby when the presser foot is raised the said drawing means is rendered inoperative.

2. In combination, means for folding together the edges of a strip of material and turning them inward to form a hem, a sewing machine having the usual feeding means and adapted to sew a seam longitudinally of the turned edges, and means between the edge turning device and the sewing machine contacting the edges only for drawing the' edges through the edge turning device.

3. In combination, means for folding together the edges of astrip of material and turning them inward to form a hem, a sewing machine having the usual feeding means and adapted to sew a seam longitudinally of the turned edges, means between the edge turning device and the sewing machine contacting the edges only for drawing the edges through the edge turning device, and means contacting the full width of the folded strip for drawing the material away from the sewing machine.

4. In combination, means for folding together the edges of a strip of material and turning them inward to form a hem, a sewing machine having the usual feeding means and adapted to sew a seam longitudinally of the turned edges, a fixed roller beneath the turned edges between the edge-turning device and the sewing machine, a roller above the edges and said first named roller and movable-in a vertical direction, a spring normally drawing the upper roller downward, said sewing machine having a presser foot, and an arm extending from the presser foot adapted to raise the upper roller, when the presser foot is raised.

5. In apparatus for forming tubes, a support adapted to support a roll of fabric with its axis vertical, a vertical guide adjustable horizontally and about which the fabric from the roll may be fed, a device beyond the guide for contacting only the edges of the'fabric and turning them, a sewing machine adapted to sew together the turned edges, and means between the sewing machme and the edge-turning device for drawing the fabric from the r011 and through the device. l I

6. In apparatus for forming tubes, a roller for supporting the fabric, a tension device 5, connected to the roller, means for drawing the fabric from the roll, means for folding the fabric along a median line, means thereafter contacting the ed es of the fabric for turning them, and an a justable bar parallel with said roller and adapted to guide the 10 ed es into the edge turning device;

bigned at Chicago, county bf Cook, and State of Illinois, the 4th day of March, 1922.

. ALBERT KRASA. 

